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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Structural Engineering and Mechanics
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Volume 5, Issue 6 - Nov 1997
Volume 5, Issue 5 - Sep 1997
Volume 5, Issue 4 - Jul 1997
Volume 5, Issue 3 - May 1997
Volume 5, Issue 2 - Mar 1997
Volume 5, Issue 1 - Jan 1997
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Soil-structure interaction and axial force effect in structural vibration
Gao, H. ; Kwok, K.C.S. ; Samali, B. ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 1~19
DOI : 10.12989/sem.1997.5.1.001
A numerical procedure for dynamic analysis of structures including lateral-torsional coupling, axial force effect and soil-structure interaction is presented in this study. A simple soil-structure system model has been designed for microcomputer applications capable of reflecting both kinematic and inertial soil-foundation interaction as well as the effect of this interaction on the superstructure response. A parametric study focusing on inertial soil-structure interaction is carried out through a simplified nine-degree of freedom building model with different foundation conditions. The inertial soil-structure interaction and axial force effects on a 20-storey building excited by an Australian earthquake is analysed through its top floor displacement time history and envelope values of structural maximum displacement and shear force.
Torsional analysis for multiple box cells using softened truss model
Yang, Daili ; Fu, Chung C. ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 21~32
DOI : 10.12989/sem.1997.5.1.021
A new torsional analysis method for multiple cell box based on the Softened Truss Model Theory was developed. This softened truss model unifies shear and torsion to address the problem associated with a torque applied on a box. The model should be very useful for the analysis of a reinforced concrete box under torque, especially for the bridge superstructure with multiple cell box sections.
Analysis of curved multicell box girder assemblages
Razaqpur, A. Ghani ; Li, Hangang ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 33~49
DOI : 10.12989/sem.1997.5.1.033
A method of analysis is proposed for curved multicell box girder grillages. The method can be used to analyze box girder grillages comprising straight and/or curved segments. Each segment can be modelled by a number of beam elements. Each element has three nodes and the nodal degrees of freedom (DOF) consist of the six DOF for a conventional beam plus DOF to account for torsional warping, distortion, distortional warping, and shear lag. This element is an extension of a straight element that was developed earlier. For a more realistic analysis of the intersection regions of non-colinear box girder segments, the concept of a rigid connector is introduced, and the compatibility requirements between adjoining elements in those regions are discussed. The results of the analysis showed good agreement with the shell finite element results, but the proposed method of analysis needs a fraction of the time and effort compared to the shell finite element analysis.
Inelastic response of code-designed eccentric structures subject to bi-directional loading
Chandler, A.M. ; Correnza, J.C. ; Hutchinson, G.L. ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 51~58
DOI : 10.12989/sem.1997.5.1.051
The influence of bi-directional earthquake-induced loading on eccentric (plan-asymmetric) building systems has been investigated. In the first part of the study, comparisons have been made with equivalent results from uni-directional studies. The results are important in developing analytical models appropriate to the formulation of design recommendations. It is concluded that for valid comparisons, both perpendicular horizontal earthquake components must be considered when using models with transversely-orientated elements. In the second part of the study, an assessment has been made of a simplified, unidirectional (lateral) design approach. For stiffness-eccentric systems, the latter approach gives accurate and reasonably conservative estimates of the critical flexible-edge deformation, but may under estimate the stiff-edge element ductility demand by a factor of two in the short-period range.
A two-step method for the optimum design of trusses with commercially available sections
Oral, Suha ; Uz, Atilla ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 59~68
DOI : 10.12989/sem.1997.5.1.059
A two-step method is presented for the optimum design of trusses with available sections under stress and Euler buckling constraints. The shape design of the truss is used as a means to convert the discrete solution into a continuous one. In the first step of the method, a continuous solution is obtained by sizing and shape design using an approximate polynomial expression for the buckling coefficients. In the second step, the member sizes obtained are changed to the nearest available sections and the truss is reconfigured by using the exact values for the buckling coefficients. The optimizer used is based on the sequential quadratic programming and the gradients are evaluated in closed form. The method is illustrated by two numerical examples.
An efficient six-node plate bending hybrid/mixed element based on mindlin/reissner plate theory
Mei, Duan ; Miyamoto, Yutaka ; Iwasaki, Shoji ; Deto, Hideaki ; Zhou, Benkuan ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 69~83
DOI : 10.12989/sem.1997.5.1.069
A new efficient hybrid/mixed thin~moderately thick plate bending element with 6-node (HM6-14) is formulated based on the Reissner-Mindlin plate bending theory. The convergence of this element is proved by error estimate theories and verified by patch test respectively. Numerical studies on such an element as HM6-14 demonstrate that it has remarkable convergence, invariability to geometric distorted mesh situations, to axial rotations, and to node positions, and no "locking" phenomenon in thin plate limit. The present element is suitable to many kinds of shape and thin~moderately thick plate bending problems. Further, in comparison with original hybrid/mixed plate bending element HP4, the present element yields an improvement of solutions. Therefore, it is an efficient element and suitable for the development of adaptive multi-field finite element method (FEM).
Effect of lateral restraint on the buckling behaviour of plates under non-uniform edge compression
Bedair, Osama K. ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 85~104
DOI : 10.12989/sem.1997.5.1.085
The paper investigates the influence of lateral restraint on the buckling behaviour of plate under non-uniform compression. The unloaded edges are assumed to be partially restrained against translation in the plane of the plate and the distributions of the resulting forces acting on the plate are shown. The stability analysis is done numerically using the Galerkin method and various strategies the economize the numerical implementation are presented. Results are obtained showing the variation of the buckling load, from free edge translation to fully restrained, with unloaded edges simply supported, clamped and partially restrained against rotation for various plate aspect ratios and stress gradient coefficients. An apparent decrease in the buckling load is observed due to these destabilizing forces acting in the plate and changes in the buckling modes are observed by increasing the intensity of the lateral restraint. A comparison is made between the budding loads predicted from various formulas in stability standards based on free edge translation and the values derived from the present investigation. A difference of about 34% in the predicted buckling load and different buckling mode were found.
Simulation of concrete shrinkage taking into account aggregate restraint
Tangtermsirikul, Somnuk ; Nimityongskul, Pichai ;
Structural Engineering and Mechanics, volume 5, issue 1, 1997, Pages 105~113
DOI : 10.12989/sem.19126.96.36.199
This paper proposes a model for simulating concrete shrinkage taking into account aggregate restraint. In the model, concrete is regarded as a two-phase material based on shrinkage property. One is paste phase which undergoes shrinkage. Another is aggregate phase which is much more volumetrically stable. In the concrete, the aggregate phase is considered to restrain the paste shrinkage by particle interaction. Strain compatibility was derived under the assumption that there is no relative macroscopic displacement between both phases. Stresses on both phases were derived based on the shrinking stress of the paste phase and the resisting stress of the aggregate phase. Constitutive relation of paste phase was adopted from the study of Yomeyama, K. et al., and that of the aggregate phase was adopted from the author's particle contact density model. The equation for calculating concrete shrinkage considering aggregate restraint was derived from the equilibrium of the two phases. The concrete shrinkage was found to be affected by the free shrinkage of the paste phase, aggregate content and the stiffness of both phases. The model was then verified to be effective for simulating concrete shrinkage by comparing the predicted results with the autogeneous and drying shrinkage test results on mortar and concrete specimens.